Double piston pneumatic filing machine



Sept. 27, 1966 o. HENDRICKSON 3,274,895

DOUBLE PISTON PNEUMATIC FILING MACHINE Filed Sept. 4, 1965 4 Sheets-Sheet l 9 Fig. I0

Hendr/c/rson 1N VEN TOR.

Sept. 27, 1966 Q, HENDRICKSON DOUBLE PISTON PNEUMATIC FILING MACHINE 4 Sheets-Sheet 2 Filed Sept. 4, 1963 0770 Hendr/ckson IN VEN TO R.

Sept. 27, 1966 o. HENDRICKSQN 3,274,895

DOUBLE PISTON PNEUMATIC FILING MACHINE Filed Sept. 4, 1963 4 Sheets-Sheet 5 MEL @HIT

Sept. 27, 1966 Q HENDRICKSQN 3374,85

DOUBLE PISTON PNEUMATIC FILING MACHINE Filed Sept. 4, 1963 4 Sheets-Sheet 4 United States Patent 3 274 DOUBLE PISTON PNEUMATIC FILING MAEHINE This invent-ion relates to a novel and useful fluid motor and to a fluid motor which has been designed specifically for use as a mean-s for actuating a filing machine constructed integrally therewith.

The pneumatic filing machine of the instant invention is provided with a pair of generally parallel piston bores in which a pair of pistons are reciprocably mounted. The filing machine further includes a pair of side-by-side and elongated parallel tool carriers which are mounted for reciprocal movement along paths generally paralleling the paths of movement of the pistons. Mean-s is provided for interconnecting the pistons for inverse movement relative to each other and the tool carriers are operatively connected to the corresponding piston for move ment therewith whereby the tool carriers are also interconnected for inverse reciprocal movement. In this manner, the major reciprocating parts of the pneumatic filing machine move in timed sequence relative to each other and in opposite directions whereby vibration of the body of the machine caused by the rapidly reciprocating parts thereof is maintained at a minimum. These structural features all combine to accomplish the main object of this invention which is to provide a pneumatic fi-l-ing machine having reciprocating parts that will operate with a minimum amount of vibration.

Another object of this invent-ion is to provide a pneumatic filing machine of the type described which is constructed in a manner whereby the tendency of the machine to oscillate about a horizontal axis extending transversely of the direction of movement of the tool carriers will be minimized and to this end the reciprocating pistons and means drivingly connecting the pistons for inverse reciprocal movement and the pistons to the tool carriers are postioned at one end of the filing machine remote from the handle thereof whereby force applied to the handle will be transmitted through a relatively long lever arm to resist oscillation of the filing machine about a horizontal axis extending transversely of the path of movement of the pistons and tool carriers.

Still another object of this invention is to provide additional means for drivingly interconnecting the tool carriers of the filing machine at a point positioned remote from the driving connection between the pistons and the tool carriers in order that the shock of impact of either of the tool carriers with a relatively immovable object will be more evenly distributed through the filing machine.

Yet another object of this invention is to provide a valve assembly operable to intermittently admit fluid under pressure to the opposite ends of the bores and vent the latter to the ambient atmosphere in timed sequence with reciprocation of the pistons including fluid pressure accumulator means intermediate the cylinders or bores and the main control valve of the filing machine utilized to admit fluid pressure from a source thereof to the filing machine.

A further object of this invention, in accordance with the immediately preceding object, is to provide a fluid pressure accumulator which is spaced equidistant from the opposite ends of the piston bores.

A final object of this invention to be specifically enumerated herein is to provide a pneumatic filing machine in accordance with the preceding objects which will conform to conventional forms of manufacture, be of simple construction and easy to use so as to provide a device that will be economically feasible, long lasting and relatively trouble-free in operation.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a top plan view of the pneumatic filing machine of the instant invention;

FIGURE 2 is a side elevational view of the embodiment illustrated in FIGURE 1;

FIGURE 3 is an end elevational view of the filing machine as seen from the right side of FIGURE 2;

'FIGURE 4 is an end elevational view of the filing machine as seen from the left side of FIGURE 2 and with the end plate thereof removed and shown in reversed front to rear relation in order to more clearly illustrate the combined fluid intake and exhaust passages;

FIGURE 5 is an enlarged longitudinal vertical sectional view taken substantially upon the plane indicated by section line 55 of FIGURE 1;

FIGURE 6 is a horizontal sectional view taken substantially upon the plane indicated by the section line 6-6 of FIGURE 5 and with parts of one of the pistons being broken away .and shown in section;

FIGURE 7 is a bottom plan view of the filing machine with parts thereof being broken away;

FIGURE 8 is a horizontal sectional view on somewhat of a reduced scale taken sub-stantially upon a plane indicated by section line 8-8 of FIGURE 5;

FIGURE 9 is an enlarged transverse vertical sectional view taken substantially upon the plane indicated by section line 99 of FIGURE 1;

FIGURE 10 is an enlarged transverse vertical sectional view taken substantially upon the plane indicated by the section line 101tl of FIGURE 1;

FIGURE 11 is an end elevational view of the other end plate of the pneumatic motor as seen from the piston side thereof;

FIGURE 12 is a fragmentary staggered horizontal sectional view taken substantially upon staggered planes passing through the fluid intake passage, the combination inlet and exhaust passages for the cylinder bores .and the valve chamber;

FIGURE 13 is a fragmentary enlarged top plan view of the filing machine with parts of the valve assembly being broken away and shown in section;

FIGURE 14 is a perspective view of one of the tool carriers of the filing machine shown on somewhat of a reduced scale; and

FIGURE 15 is an exploded perspective view of the valve assembly.

Referring now more specifically to the drawings the pneumatic filing machine Iii of the instant invention includes a rear handle 12, a front grip 14, and a control valve actuator 16 which is carried by the handle 12.

The body 18 of the filing machine It] includes a front section 20 and a rear section 22. The rear section 22 merely defines a rearwardly projecting extension of the body 18 for supporting the handle 12 and the control valve actuator 16 and also for other purposes which will be hereinafter more fully set forth.

The front section 20 includes a front end Wall 24 and a rear end wall 26 which is disposed between the confronting ends of the front and rear sections 20 and 22.

As can best be seen from FIGURES 6 and 9 of the drawings, the front section 26 has a pair of longitudinal bores 30 and 32 formed therein in which a pair of pistons 34 and 36 are longitudinally reciprocable.

The front section 20 has an upstanding bore 38 formed therein and which is disposed between and communicates with the bores 30 and 32. The bore 38 has a sleeve 4-0 secured therein and the upper end of the sleeve 40 terminates in an outwardly projecting integral annular portion 42 which in turn terminates at its outer periphery in an enlarged sleeve section 44. The annular portion 42 is seated against the shoulder 46 defined between the bore 38 and the counterbore 48. The upper end of the counterbore 48 is itself provided with a second counterbore 50 and it will be noted that the upper end of the counterbore 58 is closed by means of a closure plate 52 which is held in position by means of suitable fasteners 54, see FIGURE 1. Each of the pistons 34 and 36 is provided with a laterally inwardly opening recess 58 in which a rack gear 68 is secured by means of suitable fasteners 62, see FIGURE 6. The rack gears 68 include teeth 64 meshed with the teeth 66 carried by the gear wheel 68 journalled in the lower end of the sleeve 40 by means of a shank or shaft portion 78 carried by the gear wheel 68. By this construction it may be seen that pistons 34 and 36 are drivingly connected for inverse reciprocation.

The front section 20 of the body 18 is provided with a downwardly opening recess 72 which communicates the bores 30 and 32 and is therefore in turn communicated with the interior of the sleeve 40. A hearing plate 74 is provided and closes the lower end of the recess 72 and is secured to the undersurface of the body 18 by means of suitable fasteners 76 secured through apertures 78 formed in the bearing plate 74. The bearing plate 74 is provided with a pair of elongated slots 88 and each tool carrier of a pair of tool carriers 82 is provided with an upstanding connecting lug 84 slidably received in the corresponding slot 80 and a corresponding recess 86 defined between the associated piston and rack gear 60. In this manner, the pistons 34 and 36 are drivingly associated with the tool carriers 82 to effect longitudinal reciprocation of the latter in response to longitudinal reciprocation of the pistons.

Each of the tool carriers 82 is generally channel-shaped in cross-section and includes a pair of fillers fill which, together with the upper surfaces of the tool carriers 82 and the fillers 92 from which the connecting lugs 84 are supported, are disposed in sliding contacting relation with the undersurface of the bearing plate 74. In addition, the rack gears 94 carried by the rear ends of the tool carriers 82 are also supported from fillers 96 which have upper surfaces disposed in sliding contacting relation with the undersurface of the bearing plate 74. A pair of elongated retaining flanges 98 are provided and are secured to the lower portion of the opposite sides of the body 18 in any convenient manner such as by fasteners 99 and include inwardly directed retaining flange portions 100 which underlie the remote marginal edge portions of the tool carriers 82. Still further, a retaining plate 102 is provided and is secured to the bearing plate 74 by means of fasteners 76 and includes portions which underlie the adjacent marginal edge portions of the tool carriers 82. In this manner, the tool carriers 82 are supported from the body 18 for longitudinal reciprocal movement and against lateral movement in any direction.

The rear section 22 is provided with a downwardly opening recess 106 defining a shank 108 on which a gear wheel 110 is rotatably journalled. The gear wheel 110 is meshed with the teeth of the rack gear 94 and thereby interconnects the rear ends of the tool carriers 82 so as to more evenly distribute any shock of impact of the tool carriers 82 with a relatively immovable object. The rack gears 94 project upwardly through openings or elongated slots 112 formed in the bearing plate 74 and it will be noted that the rack gears 68 and 94 are disposed in vertically spaced planes whereby a more complete guiding action is applied to the tool carriers 82.

The rear section 22 of the body 18 includes an inlet fitting 114 threadedly engaged in an internally threaded inlet bore 116. The inlet bore 116 is communicated with the midportion of an upstanding bore 124) and the latter includes an annular seat 122 against which a ball valve 124 is yieldingly urged by means of a compression spring 126 held within the lower end of the bore by means of a plug 127. The control valve assembly 16 includes a valve assembly 128 having an abutment pin 138 slidably disposed in the upper end of the bore 120 and its lower end engaged with the ball valve 124. The trigger 132 of the valve assembly 128 is carried by the handle 12 and engaged with the abutment pin and may be utilized to urge the latter downwardly so as to unseat the ball valve 124 from the seat 122 and thereby communicate the longitudinal bore 134 of the inlet passage 118 with the inlet bore 116. The end of the bore 134 remote from the bore 120 is disposed in registry with an opening 136 formed through the end wall 26 and the opening 136 is in turn communicated with a section 138 of the inlet passage 118 formed in the front section 20. The end of the section 138 remote from the opening 136 opens into the chamber 140 defined by the sleeve section 44. The chamber 140 comprises a fluid pressure accumulator and may therefore be utilized to store quantities of fluid under pressure which would not otherwise be able to be stored in the inlet passage 118.

The front section 20 of the body =18 is provided with two pairs of longitudinal bores 142, 144, 146 and 148 and corresponding ends of the bores 1 42 and 144 open through the forward end of the section 20 while the other pair of ends of the bore 142 and 144 open upwardly through angulated end portions 158 thereof through shoulder 46 and through a distributing plate 154. The rear ends of the bores 146 and 148 open through the rear end of the section 20 and the forward ends of the bores 146 and 148 also open upwardlythrough the shoulder 46 defined between the counterbore 48 and the bore 38 by means of angulated end portions 150. The bores 142, 144, 146, and 148 each define combination passage means for both admitting fluid into the opposite ends of the bores 30 and 32 and venting the opposite ends of the bores 30 and 32 to the ambient atmosphere.

The distributing plate 154 is centrally apertured as at 156 and has two pairs of arcuate openings 162, 164, 166 and 168 formed therein, see FIGURE 15. The distributing plate 154 is disposed in the sleeve section 44 with its undersurface in surface-to-surface contacting relation with the upper surface of the annular portion 42 of sleeve 48 and is keyed within the sleeve section 44 by means of a pin '17!) received in the notch 172 formed in the periphery of the distributing plate 154 and secured in an appropriate bore (not shown) formed in the front section 20.

The opening 162, 164, 166 and 168 are registered with the upwardly directed end portions of longitudinal bores 142, 144, 146 and 148. A valve shaft 176 is provided and rotatably received in the upper end of the sleeve 40. The shaft 176 includes a head 178 having a lower surface 180 disposed in sliding contacting relation with the upper surface of the distributing plate 154. In addition, the shaft 176 is provided with a longitudinal bore 182 whose upper end opens upwardly into a transverse passage 184 formed in the head 178 and whose lower end opens downwardly to the lower end of the shaft 176. The opposite ends of the transverse passage 184 open downwardly through the lower surface 180 as at 186 .and 188. The head 178 is also provided with a pair of upstanding bores 198 and 192 and the lower ends of the bores 1% and 192 open downwardly to the lower surface 188 while the upper ends of the bores 190 and 192 open through the upper surface of the head 178.

The shank or shaft portion 78 has a longitudinal bore 196 formed therethrough and the upper end of the bore 196 is communicated with the lower end of the bore .182. In this manner, the transverse passage 184 and therefore the bore 196 may be selectively registered with all of the bores 142, 14 4, 146 and 148. Still further, inasmuch as the lower ends of the bores 190 are also selectively registerable with the openings 162, 164, 166 and 168, the bores 190 and 192 may also be placed in communication with the bores 142, 144, 146 and 148.

The bearing plate 74 includes an upstanding fitting 200 which is supported in alignment with the bore 196 from the upper surface of the bearing plate 74 and which projects upwardly into the recess 72. The fitting 200 includes a cylindrical portion 202 having two pairs of diametrically opposite openings 204 formed therein for purposes which will be hereinafter more fully set forth.

The upper end of the shank or shaft portion 70 is provided with a transverse slot 206 which defines a bifurcated upper end of the shank portion 70 between whose furcations -8 and 210 a pair of depending lugs 21-2 carried by the lower end of the shaft 176 are received. The lugs 212 are tapered toward their radially outermost ends as can best be seen from FIGURE 13 of the drawings and therefore it may be seen that the head 178 may be oscillated slightly relative to the shaft portion 70.

The end walls 24 and 26 are secured to the respective ends of the front wall 20 in any convenient manner such as by fasteners 214 and 216 respectively and it will be noted that an additional fastener 218 is utilized to secure the lower end portion of the rear section 22 to the rear end of the front section 20 with the end wall disposed therebetween.

An oil reservoir 220 is formed in the rear section 22 and generally parallels the branch 134 of the inlet passage 118 and is disposed immediately therebelow and is communicated therewith by means of bleed passages 222 and 224. A wick 226 is disposed in the reservoir 220 and air passing through the inlet passage 118 causes a small quantity of oil from the oil soaked wick 226 to move upwardly into the inlet passage 118. Oil may be placed within the reservoir 220 by removing the access plug 228, see FIGURE 1, which is threaded in the outer end of an access bore (not shown) communicated with the reservoir 220 at its inner end.

The end wall 24 has a pair of grooves 230 and 232 formed therein which communicate one end of the bores 30 and 32 with the passages 142 and 144, respectively. In addition, it may be seen from FIGURE 11 of the drawings that the end wall 26 also includes a pair of grooves 234 and 236 which communicate the other end of bores 30 and 32 with the passages 148 and 146, respectively.

The front grip 14 is secured to the forwardmost end of the front section 20 in any convenient manner as by threaded fasteners 238 and the handle 12 is secured to the rear portion of the front section 20 by means of fasteners 240 and to the rear end of the rear section 22 by means of fasteners 242. It is to be further noted that a pair of body files 244 may be readily secured to the tool carriers 82 in any convenient manner such as by fasteners 246.

In operation, as the trigger 132 of the control valve assembly 16 is actuated, air under pressure is admitted into the inlet passage 118 and passes therefrom through the section 138 and into the chamber 140. Assuming now the bores 190 and 192 to be registered with the arcuate openings 164 and 166, fluid under pressure is admitted into the forward end of the bore 30 and the rear end of the bore 32 through the passages 1:44 and 148 as designated by the arrows in dotted line in FIGURE 12 of the drawings. At the same time, the opposite ends of the transverse passage 184, which open downwardly to the lower surface 180 as at 186 and 188, are registered with the arcuate openings 162 and 168 and thereby communicate the rear of the bore 30 and the forward end of the bore 32 to the ambient atmosphere by means of the transverse passage 184, the bores 182 and 196, and the fitting 200. As the exhausted air passes outwardly through the fitting 200, the remaining portion of lubricant therein serves to lubricate the rack gears 60, the gear wheel 58, the tool carriers 82, and the bearing plate 74.

Assuming now that the pistons 34 and 36 have moved to the rear and forward ends respectively of the forward section 20, the head 178, at this point, has been rotated in a clockwise direction as viewed in FIGURE 12 of the drawings a sufficient distance to terminate communication of the transverse passage 184 with the passages 142 and 146 and the bores 1% and 192 with the passages 144 and 148 and initial communication between the transverse passage 184 and the passages 144 and 148 and the bores 190 and 192 with the passages: 146 and 142 has been effected. At this point, the rear end of the bore 38 and the forward end of the bore 32 will be communicated with fluid under pressure and the front end of the bore 30 and the front end of the bore 32 'will be communicated with the ambient atmosphere. Although this will immediately reverse the direction of movement of the pistons 34 and 36, the lost motion connection between the shaft 176 and the shank 70 will enable the inertia of the head 178 to cause continued rotation of the head 178 until the lost motion connection between the shaft portion 70 and the shaft 176 is taken up and the reverse movement of the pistons 34 and 36 will be effective in reversing the rotation of the head 178.

Inasmuch as the chamber defines a fluid pressure accumulator, fluid under pressure may be quickly delivered to the opposite ends of the bores 30 and 32. Further, since the chamber 140 is disposed between the opposite ends of the bores 38 and 32, the operation of the pneumatic filing machine 10 is further improved, Still further, inasmuch as the handle 12 is supported from the rear of the body 18 and the driving connections between the pistons 34 and 36 and the tool carriers 82 are disposed at the forward end of the body 18, a. longer lever arm is provided to overcome any tendency of the filing machine to oscillate about a horizontal axis extending transversely thereof.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A pneumatic filing machine, comprising: a body having cylinder bore means, valve chamber means and combination intake and exhaust passage means therein, said combination means communicating the ends of said cylinder bore means with said valve chamber means; piston means slidingly received within said cylinder bore means and adapted to reciprocate in said cylinder bore means; valve means positioned in said valve chamber means and operably associated with said piston means for alternately admitting fluid under pressure to one end of said cylinder bore means and venting the other end of said cylinder bore means to the ambient atmosphere in response to the reciprocation of said piston means; and tool carrier means closely underlying said piston means, and means drivingly connecting the piston means with the tool carrier means adjacent the front end of the body, said cylinder bore means comprising a pair of parallel juxtapositioned cylinder bores, said piston means lncluding a pair of double ended pistons slidingly received within said cylinder bores, said body and tool carrier means being substantially twice as long as the cylinder bores whereby the tool carrier means are reciprocated by force exerted at the forward ends thereof.

2. A pneumatic filing machine as described in claim 1 wherein, said valve chamber means includes: a cylindrical chamber having a diametrically enlarged end portion intermediate the ends of said cylinder bores and in communication with each of said cylinder bores and positioned substantially perpendicular to the plane of said cylinder bores.

3. A pneumatic filing machine comprising a body defining a pair of side-by-side and generally parallel cylinder bores, a pair of pistons reciprocable in said bores, said pistons defining confronting recesses and having opposing rack gears in said recesses, and a gear wheel journalled from said body for oscillation about an axis disposed at generally right angles to the plane in which the longitudinal center lines of said bores are disposed and disposed in mesh with said rack gears and thereby interconnecting said pistons for inverse movement relative to each other, a pair of elongated tool carriers, coacting bearing means on said body and carriers mounting said carriers on said body for longitudinal reciprocation generally paralleling said pistons and disposed in a plane generally paralleling the first mentioned plane, and a pair of lugs extending between said pistons and said carriers and drivingly connecting said pistons to said carriers, said lugs being disposed adjacent one end of said body.

4. The combination of claim 3 wherein said rack gears define recesses opening toward said tool carriers, said lugs being carried by said carriers and removably seated in said last mentioned recesses.

5. The combination of claim 1 including a pair of elongated tool carriers, coacting bearing means on said body and carriers mounting said carriers on said body for longitudinal reciprocation generally paralleling said pistons and disposed in a plane generally paralleling the first mentioned plane, and a pair of lugs extending between said pistons and said carriers and drivingly connecting said pistons to said carriers, said lugs being carried by one pair of corresponding end portions of said carriers, the other pair of end portions of said carriers including confronting rack gears, and an idle gear wheel journalled from said body for rotation about an axis substantially perpendicular to said planes and disposed in mesh with said last mentioned rack gears.

6. A pneumatic filing machine comprising a body defining a cylinder bore means, piston means reciproca'ble in said bore means, combination fluid intake and exhaust passage means communicated with each of the opposite end portions of said bore means, said body defining a valve chamber bore including a closed diametrically enlarged counterbore at one end, said combination passage means opening into said counterbore, inlet passage means opening into said counterbore remote from said bore, a headed hollow valve shaft journaled in said bore with the head thereof disposed in said counterbore, said head and hollow shaft defining an exhaust passage opening toward said shoulder and registrable with said combination passage means at its inlet end and opening outwardly of said shaft remote from said head at its outlet end, said head defining an intake passage having an inlet end opening outwardly of said head into said counterbore and an outlet end opening toward said shoulder and registrable with said combination passage means, and means drivingly coupling said piston means and valve shaft together for oscillation of the latter in timed sequence with the reciprocation of said piston means, said cylinder bore means including a pair of generally parallel cylinder bores, said piston means includes a pair of pistons, one of said pistons being reciprocable in each of said bores, said pistons defining confronting recesses and having opposing rack gears secured in said recesses, and a gear wheel journalled from said body for oscillation about an axis disposed at generally right angles to the plane in which the longitudinal center lines of said bores are disposed and disposed in mesh with said rack gears and thereby interconnecting said pistons for inverse movement relative to each other, said gear whee-1 being journalled for rotation about an axis concentric with said bore, drivingly connected to said shaft, and comprising said means drivingly coupling said pistons to said valve shaft, a pair of elongated tool carriers, coacting bearing means on said body and carriers mounting said carriers on said body for longitudinal reciprocation generally paralleling said pistons and dis- 8 posed in a plane generally paralleling the first mentioned plane, and a pair of lugs extending between said pistons and said carriers and drivingly connecting said pistons to said carriers, said lugs being disposed adjacent one end of said body.

7. The combination of claim 6 wherein the outlet end of said exhaust passage opens axially of said shaft away from said head, and exhaust directing means communicated with the outlet end of said exhaust passage for routing portions of the fluid exhausted from said cylinder bores to said coacting bearing means.

8. A pneumatic filing machine comprising an elongated body defining a longitudinally extending bore and having a piston slidably disposed in said bore, valved fluid intake and exhaust passage means communicated with the opposite ends of said bore driven by said piston for alternately admitting fluid under pressure to the opposite ends of said bore and venting the latter to the ambient atmosphere in timed sequence with reciprocation of said piston, an elongated tool carrier slidably mounted on said body for longitudinal reciprocation along a path generally paralleling the path of movement of said piston and disposed in substantial vertical alignment with and below said piston, said piston being disposed over only one end portion of said tool carrier and a vertically extending connector extending between and connecting said one end portion only of said carrier to a central portion of said piston whereby the force exerted on said carrier will be at said one end portion of said tool carrier for eliminating chat ter which occurs when the force is exerted on the tool carrier adjacent the center thereof.

9. A pneumatic filing machine comprising an elongated body, a pair of generally parallel cylinder bores disposed at one end of said body with the over-all length of the body being substantially twice as long as the length of said bores, a pair of double ended pistons reciprocal in said bores, means connecting said pistons together for simultaneous and opposite reciprocation, fluid pressure intake and exhaust means operatively associated with the op posite ends of said bores, valve means forming part of said interconnecting means to alternately admit fluid under pressure to opposite ends of said bores and vent the latter to the atmosphere in timed sequence with reciprocation of said pistons, a pair of elongated tool carriers closely under lying said bores and being mounted on said body and having an overall length substantially equal to the length of the body, means connecting said pistons to the end portions of said tool carriers whereby the tool carriers are reciprocated in inverse relation to each other by forces exerted adjacent an end portion thereof, and means mounted on said body adjacent the end thereof remote from the bores and interconnecting the ends ofsaid tool carriers remote from their connection with the pistons for inversely interconnecting the tool carriers together adjacent the rear end of the body.

10. A pneumatic filing machine comprising an elongated body, a cylinder bore extending substantially onehalf the length of said body at one end thereof, a double ended piston reciprocal in said bore, fluid pressure intake and exhaust means operatively associated with the opposite ends of said bore, -valve means operatively connected to and driven by said piston and operable in conjunction with said intake and exhaust means for alternately admitting fluid under pressure into the opposite ends of said bore and venting the latter to the ambient atmosphere in timed sequence with reciprocation of said piston, a tool carrier mounted on said body in closely underlying relation to the bore and piston and extending substantially throughout the length of said body, means connecting said piston with said tool carrier for reciprocating said tool carrier in response to reciprocation of said piston, said means interconnecting the piston and tool carrier being disposed adjacent one end of the tool carrier whereby the force exerted on the tool carrier will be at one end portion thereof rather than at the center, and means guidingly connecting the other end portion of said tool carrier to said body thus eliminating chatter of the tool carrier when filing due to normal exertion on the tool carrier at the center thereof.

11. A fluid pressure actuated machine comprising an elongated body, a longitudinally extending bore means in said body, a double ended piston means reciprocal in said bore means, fluid pressure intake and exhaust means operatively associated with opposite ends of said bore means, valve means operatively connected to and driven by said piston means and operable in conjunction with said intake and exhaust menas to alternately admit fluid under pressure and vent opposite ends of said bore means in timed sequence With reciprocation of said piston means, a tool carrier mounted on said body in closely underlying relation to the bore means and piston means, said tool carrier being elongated and substantially parallel to the path of movement of the piston means with one end portion of the tool carrier underlying the piston means, and means connecting said piston means with said tool carrier, said connecting means being connected to the tool carrier at said one end portion thereof whereby the force exerted on the tool carrier will be at said one end portion rather than at the center thereof for eliminating chatter of the tool carrier.

12. The machine as defined in claim 11 with guide means connecting the other end portion of the tool carrier and the body in longitudinally spaced relation to the bore means and piston means.

13. The machine as defined in claim 11 wherein said means connecting the tool carrier and the piston means includes a vertically extending lug means extending vertically downwardly from the longitudinally and transversely disposed central portion of the piston means.

14. A fluid pressure actuated machine comprising an elongated body, a plurality of generally parallel bore means disposed at one end of said body with the overall length of the body being substantially greater than the length of said bore means, a plurality of double-ended piston means reciprocal in said bore means, means connecting said piston means together for simultaneous and opposite reciprocation, fluid pressure intake and exhaust means operatively associated with the opposite ends of said bore means, valve means forming part of said interconnecting means to alternately admit fluid under pressure to opposite ends of said bore means and vent the latter to the atmosphere in timed sequence with reciprocation of said piston means, a plurality of elongated tool carriers closely underlying said bore means and being mounted on said body, means connecting said piston means to the end portions of said tool carriers whereby the tool carriers are reciprocated in inverse relation to each other by forces exerted thereon adjacent an end portion thereof, and means interconnecting said tool carriers adjacent the other end portion thereof remote from the connecting means between the piston means and tool carriers for simultaneous and opposite reciprocation of the remote end portions of the tool carriers for eliminating chatter of the tool carriers when reciprocated during a Working operation.

References Cited by the Examiner UNITED STATES PATENTS 955,896 4/1910 Morrison 91179 987,940 3/1911 Anderson 51170.3 1,055,781 3/ 1913 Mitchell 137625 .43 1,475,681 11/1923 Brown- 51-1703 1,493,650 5/1924 Sundstrand 51170.3 1,677,112 7/ 192-81 Anderson 1.. 91-1 79 2,251,329 8/1941 Ekstrom 91-179 2,282,648 5/ 1942 Drefahl 511'70.'3 2,350,779 6/1944 Lapkofi 51-170.3 2,635,396 4/ 1953 Johnson 51170.3 2,696,219 12/1954 Barksdale 137625.43 2,772,663 12/ 19 56 Larson 51170.3 2,925,095 2/1960 Bates 137-625.43 2,990,853 7/ 1961 Sharp 137-62543 3,056,573 10/ l-962 Matheson 25 l3'1 3,108,409 10/ 1963- Hendrickson 51170. 3

M'ARTlDN P. SCHWADRON, Primary Examiner.

FRED E. ENG ELTHALER, SAMUEL LEVINE,

Examiners. I. LABOWSKI, P. E. MASLOUSKY,

Assistant Examiners. 

1. A PNEUMATIC FILING MACHINE, COMPRISING: A BODY HAVING CYLINDER BORE MEANS, VALVE CHAMBER MEANS AND COMBINATION INTAKE AND EXHAUST PASSAGE MEANS THEREIN, SAID COMBINATION MEANS COMMUNICATING THE ENDS OF SAID CYLINDER BORE MEANS WITH SAID VALVE CHAMBER MEANS; PISTION MEANS SLIDINGLY RECEIVED WITHIN SAID CYLINDER BORE MEANS AND ADAPTED TO RECIPROCATE IN SAID CYLINDER BORE MEANS; VALVE MEANS POSITIONED IN SAID VALVE CHAMBER MEANS AND OPERABLY ASSOCIATED WITH SAID PISTON MEANS FOR ALTERNATLY ADMITTING FLUID UNDER PRESSURE TO ONE END OF SAID CYLINDER BORE MEANS AND VENTING THE OTHER END OF SAID CYLINDER BORE MEANS TO THE AMBIENT ATMOSPHERE IN RESPONSE TO THE RECIPROCATION OF SAID PISTON MEANS; AND TOOL CARRIER MEANS CLOSELY UNDERLYING SAID PISTON MEANS, AND MEANS DRIVINGLY CONNECTING THE PISTON MEANS WITH THE TOOL CARRIER MEANS ADJACENT THE FRONT END OF THE BODY, SAID CYLINDER BORE MEANS COMPRISING A PAIR OF PARALLEL JUXTAPOSITIONED CYLINDER BORES, SAID PISTON MEANS INCLUDING A PAIR OF DOUBLE ENDED PISTONS SLIDINGLY RECEIVED WITHIN SAID CYLINDER BORES, SAID BODY AND TOOL CARRIER MEANS BEING SUBSTANTIALLY TWICE AS LONG AS THE CYLINDER BORES WHEREBY THE TOOL CARRIER MEANS ARE RECIPROCATED BY FORCE EXERTED AT THE FORWARD ENDS THEREOF. 